New phenethyl alcohol glycosides from Stachys parviflora

Phytochemical investigations of the whole plant of Stachys parviflora (Lamiaceae) resulted in the isolation of two new phenethyl alcohol glycosides. The structures of the new compounds named parviflorosides A and B were established as 2-(3,4-dihydroxyphenyl)-ethyl- O -alpha-l-rhamnopyranosyl-(1 -> 2)-4- O - E -caffeoyl-beta-d-glucopyranoside (1) and 2-(3,4-dihydroxyphenyl)-ethyl- O -alpha-l-rhamnopyranosyl-(1 -> 2)-6- O - E -caffeoyl-beta-d-glucopyranoside (2), respectively. The structure elucidation of the new compounds was based primarily on 1D and 2D NMR analysis, including COSY, HMBC and HMQC correlations.